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Income Tax Expense (Benefit) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Taxes [Line Items]
Federal - current	$ 216,182	$ (53,273)	$ 207,864
State and local - current	20,799	(295)	53,654
Total current	236,981	(53,568)	261,518
Federal - deferred	18,203	468	23,814
State and local - deferred	26,543	(31,757)	2,337
Total deferred	44,746	(31,289)	26,151
Income tax expense (benefit) reported in net income	281,727	(84,857)	287,669
Employee stock plans		(2,486)	(3,225)
Adoption of ASU No. 2014-01			1,303
Securities available-for-sale	(2,687)	131	1,851
Pension liability adjustments	(2,924)	(1,161)	(14,992)
Non-credit portion of OTTI losses	49	44	142
Total income taxes	$ 282,013	$ (88,329)	$ 272,748

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